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hydrogen peroxide?!

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hi i was just wondering what strength hydrogen peroxide i should buy to use for keeping fungus off of my angel fish eggs, i know roughly what dose per gallon to use but i was just looking on ebay and there are different concentrations i can buy like 3% 10vol and 9% 30vol ect can someone let give me an idea of what is generally used

what you want is pharmaceutical 3% hydrogen peroxide, which you can get at any pharmacy. Don't order it off the internet. Its cheap, and available. anything that says 10, 20 or 30 volume is for HAIR COLORING...... do not use it.